In the past couple of weeks sometimes (not all) when I turn the key in the ignition it locks up briefly then realeases and the radio and a/c does not work. When I put it in park, the car makes a noise. Then when I restart everything is normal. My car is at the mechanic now and of course they can't find anything wrong with it because it is working just fine with them. I am afraid if it doesn't get repaired, I will get stranded somewhere and will have to get it towed.